Fill in the blanks with words from the following boxes in their proper forms.
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It was quiet those big trucks started coming through the town.
A. before
B. after
C. until
D. unless
We were told that we should we should follow the main road we reached the central railway station.
A. whenever
B. until
C. while
D. wherever
The children ran away from the orchard( 果园 ) they saw the guard.
A. the moment
B. after
C. before
D. as
No sooner had I arrived home it began to rain.
A. when
B. while
C. as
D. than